Malicious PDF — malware analysis report

Static analysis result for SHA-256 053b720df9416311…

MALICIOUS

PDF

70.7 KB Created: 2021-09-06 17:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7a8ec089ce9d5661e670225e1dcce4f8 SHA-1: 058d9342599d41cdb359ec1b3a0844b5c668da2d SHA-256: 053b720df94163119319337ce220b8766d7a5a30f29f0c3e5f6f4359a16c126d
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, likely to manipulate search engine results or redirect users to malicious sites. The embedded JavaScript is a common method for executing malicious actions within PDFs, such as downloading further payloads or exploiting vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8257

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757ee9dd650---37897073168.pdf In PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/0cb7b2bb156f9cad9e5a41e3a0aef54e/30743981359.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/cf5ccd125a20d684635b86f4a3d09cb0/dudobunajetakugumo.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/sifidagofovofizoza.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/d3de59c6ee3ebe5ef07c545d0eede0de/dajigeraden.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a31c73ad88---75694849485.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd20d33d53---muwupavulevikegumote.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae50e991a4b---limuzawifazosibojeru.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/93665212757.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/77079424783.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/lodosaw.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/nawekek.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a2e0e5c93---surukaxejaponuges.pdfIn PDF document text
    • http://etrustmi.com/ckfinder/userfiles/files/58490976968.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/76051409536.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/fapanuxasetesifipuv.pdfIn PDF document text
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/13868880316.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/gulewigitufojazexegetu.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/699db79ed5bad5bc6190716303622634/98457637136.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607307299c10b---14036922387.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/terafinazowujid.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/bolimenivosasanigagujur.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/18129797698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=husqvarna+327p4+pole+saw+manualPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC55B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6D 16456 bytes
SHA-256: 793f2587f312d42cb63f98caa2ce06fbdc43701f8b2a34ed4a9638c008cd06de